US5713259A - Saw disc for a high speed hand sawing machine - Google Patents

Saw disc for a high speed hand sawing machine Download PDF

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Publication number
US5713259A
US5713259A US08/684,215 US68421596A US5713259A US 5713259 A US5713259 A US 5713259A US 68421596 A US68421596 A US 68421596A US 5713259 A US5713259 A US 5713259A
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US
United States
Prior art keywords
disc
teeth
saw
saw disc
cutting edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/684,215
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English (en)
Inventor
Jozef Gijsbert Haanschoten
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US5713259A publication Critical patent/US5713259A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
    • B23D45/16—Hand-held sawing devices with circular saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/768—Rotatable disc tool pair or tool and carrier
    • Y10T83/7734—With guard for tool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9319—Toothed blade or tooth therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9319—Toothed blade or tooth therefor
    • Y10T83/936—Series of allochiral teeth
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9319—Toothed blade or tooth therefor
    • Y10T83/9367—Teeth having cutting edge perpendicular to blade surface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9403—Disc type

Definitions

  • the invention relates to a high speed tool, in particular a hand tool such as a rotary tool or the like with a disc, which at the outer side is provided with sawing means.
  • Such a high speed tool is known in many versions and of various suppliers and, for instance, is used as a grinding tool.
  • the speed of such a tool is high, usually 8000 or more revolutions per minute.
  • the invention aims to remove these disadvantages and to provide for a considerably inexpensive construction.
  • the above purposes are realized by providing that the saw teeth are divided over the circumference of the disc and are part thereof or are separately and permanently connected thereto.
  • each tooth has a cutting edge with an adjacent radial flank and an adjacent tangential flank.
  • the number of teeth is less than ten.
  • the European patent application EP-A-0,292,246 shows a tool for the removal of material from a wooden object, with a bowl-shaped disc with less than ten teeth at its circumference.
  • the bowl-shaped disc makes this tool unsuitable for sawing purposes.
  • the teeth have cutting edges for a radial cut and to cut in the transverse direction. Also a projection is needed for every tooth, that limits the saw depth of the tooth in both cutting directions.
  • This tool has considerably more complicated teeth than those of the invention, which also means a considerably more difficult and laborious way of grinding.
  • the invention makes use of the fact that due to the very high speed of the utilized hand tool only very few saw teeth on the circumference are needed. Moreover, a larger number of teeth would lead to either too heavy a load on the motor, that is with very high speed sawing, or a rather stiff operation, because with a larger number of saw teeth the phenomenon will occur, that a number of teeth will not cut at all, but abut the material to be sawed and slide along it, which costs unnecessary energy and causes rises in temperature as a consequence of which the saw and workpiece become too hot and the teeth become blunted rather soon.
  • High speed saws are generally suitable for wood, artificial material, plaster and the like, but not for metal or concrete. This also applies for the saw according to the invention. However, it has the important advantage that by way of the simple shape of the saw tooth and the small number of teeth, grinding thereof, for instance after a nail has been hit, can be done very fast.
  • the invention also provides for a saw disc with teeth at the circumference, which is suitably applied in the tool according to the invention.
  • a saw disc is characterized in that the number of teeth is less than ten and in that each tooth has at least a cutting edge with an adjacent radial flank and an adjacent tangential flank.
  • the radial flank does not necessarily have to be straight, but for instance may have a curved shape, which has the advantage that with the manufacturing of saw discs according to the invention in small series the material in front of the radial flank may be removed by drilling.
  • the radial flank inclines forward at the cutting edge at an angle between -5° and +15°.
  • the tangential flank has a clearance angle relative to the path of movement of the cutting edge.
  • the clearance angle lies between 2° and 5° .
  • the tangential flank lies on a circular arc, the center of which lies at a distance from the center of the disc of 0.06 to 0.3 times the distance from the outer end of the radial flank to the center of the disc, and which is located beside the bisector of a portion of the disc bounded by the radii of the disc through two successive cutting edges.
  • This embodiment has the advantage that behind the cutting edge of a tooth, first an increasing space appears followed by an again decreasing space until relatively near the radial edge of the next tooth, to thereby prevent the teeth from having too great an in-feed.
  • the number of teeth is four, specifically with discs with a diameter of 15-30 cm.
  • the disc in fact may consist of only an arm.
  • Larger numbers than four give disadvantages rather than advantages, particularly with respect to the larger number of teeth that possibly have to be sharpened.
  • the teeth have a greater thickness perpendicular to the disc at their cutting edge than the remaining part of the circumference of the disc, which greater thickness diminishes gradually behind the cutting edge to the thickness of the remaining part of the circumference of the disc.
  • the angular distance, over which a tooth has a greater thickness than the remaining part of the circumference of the disc is about 10° to 20°.
  • Such a disc may be manufactured by grinding or turning material from the middle of the disc until near the edge. Next, part of the edge can be removed, for instance when the radial clearance is made by way of grinding.
  • the teeth are offset alternately in the opposite direction from the plane of the disc.
  • the set of the teeth is about 0.1-1.0 mm.
  • the material of the saw disc according to the invention preferably has to meet the requirement that it has a satisfactory hardness, but not such a hardness that it is no longer possible to file it. This is the case with for example abrasion and rust resistant steel, for example, chromium steel.
  • a disc with the tooth shape according to the invention may also be provided with teeth of abrasion resistant material, such as widia.
  • abrasion resistant material such as widia.
  • a tool which includes the disc as described above has to be provided with a protective device, which at least guards one side of the disc.
  • the protective device has an opening to let pass a segment of the saw disc, which opening lies in a plane parallel to the axis of rotation of the saw disc.
  • the distance from the plane to the center line of the axis of rotation is adjustable. This offers the possibility to give the saw cut a predetermined depth, for example for the sawing of rabbets.
  • the invention also comprises a guard suitable to be mounted on a tool according to the invention.
  • FIG. 1 schematically shows a side view of the saw disc according to the invention
  • FIG. 2 shows a radial view thereof
  • FIG. 3 shows a corresponding view of another embodiment
  • FIG. 4 shows a view of the saw disc with the protective device for it
  • FIG. 5 shows a side view of the protective device according to FIG. 4,
  • FIG. 6 shows a lower view of the protective device.
  • FIG. 1 a steel disc is indicated with 1, provided with four teeth 2, which have a slightly larger thickness than the disc 1, as appears from FIG. 2.
  • the teeth 2 are preceded by a recess 3, which preferably is slightly larger than a semi-circle.
  • the original circle shaped circumference of the disc 1 is indicated with 4, A being the center of said circumference forming circle.
  • said circle goes through the cutting edge, which is indicated with the point 5 of the cutting teeth.
  • a circular arc is drawn with center B, which is located somewhat beside the bisector of the radii from A to both cutting edges 5 and below the center A.
  • Point B has been chosen such that a predetermined in-feed 6 is left clear and furthermore that the edge 7 of the disc from right to left is located first at the level of a cutting edge 5, then deflects inwardly from the circular shape and finally, near the next cutting edge 5, is located at a distance of approximately the total in-feed within the circle through the cutting edges 5.
  • point B has been chosen such that a distance between point B and point A ranges from 0.06 to 0.3 times a distance from the cutting edge 5 to point A, point B being located beside a bisector of a portion of the disc bounded by radii of the disc taken at two successive cutting edges.
  • the cutting edges 5 have a front flank or radial flank 8, which encloses an angle "a” with the radius of the circle and a rear flank, or tangential flank 27.
  • the clearance angle relative to the path of the cutting edge is indicated with "b”.
  • FIG. 2 shows a view along line II--II of FIG. 1. From this can be seen that the edges 2 of the cutting teeth provide a cutting edge 5 with a greater width than that of the disc.
  • FIG. 3 shows a view of a set tooth with a cutting edge 5 and a recess 3 with a boundary 9.
  • the protective device consists of a first part 10, with a hood-shaped upper part 11, two vertical walls 12 and a vertical back wall 13.
  • Disc 14 which is provided with four cutting teeth 15 and recesses 16 in front of the teeth, has a hole 17 with which it fits over axis 18, to which it is fastened by means of nut 19.
  • the wall 13 is fastened to the housing of a rotary tool (not shown) around axis 18 with a clamping ring (not shown).
  • the protective device comprises a second part 20 with a vertical wall 21 and a horizontal plane 22.
  • a segment of disc 14 protrudes.
  • a relatively large space for disc 14 is left out in slot 23, as a result of which a possible line of sawing can be seen easily.
  • a slot 24 is provided in the side walls 21, with a wing screw 25, which is screwed in the side walls 12 of part 10 and with a guiding pin 26, which is also mounted on wall 12.
  • the shown protective device is safer than a guard as is commonly used with grinding tools in which bottom 22 is missing.
  • slots 24 and wing screws 25 allow for sawing in a perpendicular direction with a desired cutting depth.
  • teeth of the described shape made of abrasion or rust resistant steel
  • teeth made of hardmetal This is more expensive than forming the teeth out of the disc itself, but will give a longer working life.
  • a widia tooth will become irreparably damaged.
  • the combination of sawing tool and protective device gives the ability of sawing along a perpendicular path with one hand, with the object to be sawed held in the other hand. Also the tool can be put away safely without the saw disc contacting anything.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Walking Sticks, Umbrellas, And Fans (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US08/684,215 1995-08-01 1996-07-19 Saw disc for a high speed hand sawing machine Expired - Fee Related US5713259A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1000912 1995-08-01
NL1000912A NL1000912C1 (nl) 1995-08-01 1995-08-01 Snel draaiende handcirkelzaag en zaagschijf daarvoor.

Publications (1)

Publication Number Publication Date
US5713259A true US5713259A (en) 1998-02-03

Family

ID=19761388

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/684,215 Expired - Fee Related US5713259A (en) 1995-08-01 1996-07-19 Saw disc for a high speed hand sawing machine

Country Status (5)

Country Link
US (1) US5713259A (de)
EP (1) EP0756912B1 (de)
AT (1) ATE233634T1 (de)
DE (1) DE69626453T2 (de)
NL (1) NL1000912C1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6450075B1 (en) * 1999-06-25 2002-09-17 Alex Manzo Ventilated air cooled cutting system
US6691596B1 (en) 2000-02-29 2004-02-17 Irwin Industrial Tool Company Circular saw blade for cutting fiber cement materials
DE19822948B4 (de) * 1997-05-26 2006-06-22 Heisel, Uwe, Prof. Dr.-Ing. Dr.h.c. Spanabhebendes, drehendes Werkzeug
US20080022832A1 (en) * 2006-07-27 2008-01-31 Black & Decker Inc. Saw blade for cutting cement board
US20110179932A1 (en) * 2010-01-26 2011-07-28 Hyde Tools, Inc. Circular cutting blade
WO2021116480A1 (de) 2019-12-13 2021-06-17 Festool Gmbh Vorritzwerkzeug für eine sägemaschine
US20210291285A1 (en) * 2017-04-21 2021-09-23 Husqvarna Ab Cutting Blade and Method for Producing Such a Blade

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1741508A1 (de) * 2005-03-18 2007-01-10 Speedy Cut S.r.l. Kreissägeblatt
BR112014009464A2 (pt) * 2011-10-17 2017-05-09 Suzhou Tingens Iisaw Tech Co Ltd lâmina de serra composta de chanfradura rotativa
CN108465876A (zh) * 2018-06-19 2018-08-31 黑旋风锯业股份有限公司 一种双层结构低噪音锯片基体

Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US139176A (en) * 1873-05-20 Improvement in rotary paper-cutters
US149748A (en) * 1874-04-14 Improvement in circular saws
US1550342A (en) * 1924-07-18 1925-08-18 William G Cogley Foliage trimmer
US1811079A (en) * 1930-03-08 1931-06-23 Forsyth I Roy Saw
US2366017A (en) * 1944-06-13 1944-12-26 Harold G Fortune Means for cutting casts
US2559355A (en) * 1948-09-15 1951-07-03 Conrad Wolfgang Schnyder Saw
GB713368A (en) * 1952-03-31 1954-08-11 Slack Sellars & Company Ltd Improvements in circular saws
US3125139A (en) * 1964-03-17 Circular saw blades for operation in a common kerf
US3406729A (en) * 1966-05-02 1968-10-22 Delbert P. Cooper Gullet-guarded carbide-tipped saw
DE2101614A1 (de) * 1970-01-14 1972-07-27 Franz Lipowsky, Sägen- und Maschinenmesserfabrik, Wien Gattersäge
US4034638A (en) * 1976-07-29 1977-07-12 Mccrary Saw & Tool Company Circular saw having reduced noise
EP0072642A2 (de) * 1981-08-13 1983-02-23 Blount, Inc. Sägeblatt
DE3305113A1 (de) * 1983-02-15 1984-08-23 Dieter 8472 Schwarzenfeld Gröschke Kreissaegenblatt
US4515055A (en) * 1981-08-13 1985-05-07 Omark Industries, Inc. Circular saw blade
FR2570317A1 (fr) * 1984-09-20 1986-03-21 Mazelin Michel Lame circulaire a denture de type " gouge "
EP0292246A2 (de) * 1987-05-20 1988-11-23 Arbortech Industries Pty Ltd. Holzbearbeitungswerkzeug
US5090287A (en) * 1991-01-22 1992-02-25 Chezem Jim A Circular tool assembly
US5216797A (en) * 1991-07-17 1993-06-08 R. Hall Manufacturing Inc. Method and apparatus for debanding a bale

Patent Citations (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US139176A (en) * 1873-05-20 Improvement in rotary paper-cutters
US149748A (en) * 1874-04-14 Improvement in circular saws
US3125139A (en) * 1964-03-17 Circular saw blades for operation in a common kerf
US1550342A (en) * 1924-07-18 1925-08-18 William G Cogley Foliage trimmer
US1811079A (en) * 1930-03-08 1931-06-23 Forsyth I Roy Saw
US2366017A (en) * 1944-06-13 1944-12-26 Harold G Fortune Means for cutting casts
US2559355A (en) * 1948-09-15 1951-07-03 Conrad Wolfgang Schnyder Saw
GB713368A (en) * 1952-03-31 1954-08-11 Slack Sellars & Company Ltd Improvements in circular saws
US3406729A (en) * 1966-05-02 1968-10-22 Delbert P. Cooper Gullet-guarded carbide-tipped saw
DE2101614A1 (de) * 1970-01-14 1972-07-27 Franz Lipowsky, Sägen- und Maschinenmesserfabrik, Wien Gattersäge
US4034638A (en) * 1976-07-29 1977-07-12 Mccrary Saw & Tool Company Circular saw having reduced noise
EP0072642A2 (de) * 1981-08-13 1983-02-23 Blount, Inc. Sägeblatt
US4432264A (en) * 1981-08-13 1984-02-21 Omark Industries, Inc. Circular saw blade
US4515055A (en) * 1981-08-13 1985-05-07 Omark Industries, Inc. Circular saw blade
DE3305113A1 (de) * 1983-02-15 1984-08-23 Dieter 8472 Schwarzenfeld Gröschke Kreissaegenblatt
FR2570317A1 (fr) * 1984-09-20 1986-03-21 Mazelin Michel Lame circulaire a denture de type " gouge "
EP0292246A2 (de) * 1987-05-20 1988-11-23 Arbortech Industries Pty Ltd. Holzbearbeitungswerkzeug
US4850407A (en) * 1987-05-20 1989-07-25 Inkster Kevin Ross Wood working tool
US5090287A (en) * 1991-01-22 1992-02-25 Chezem Jim A Circular tool assembly
US5216797A (en) * 1991-07-17 1993-06-08 R. Hall Manufacturing Inc. Method and apparatus for debanding a bale
US5400493A (en) * 1991-07-17 1995-03-28 R. Hall Manufacturing Inc. Method and apparatus for debanding a bale

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19822948B4 (de) * 1997-05-26 2006-06-22 Heisel, Uwe, Prof. Dr.-Ing. Dr.h.c. Spanabhebendes, drehendes Werkzeug
US6450075B1 (en) * 1999-06-25 2002-09-17 Alex Manzo Ventilated air cooled cutting system
US6691596B1 (en) 2000-02-29 2004-02-17 Irwin Industrial Tool Company Circular saw blade for cutting fiber cement materials
US20080022832A1 (en) * 2006-07-27 2008-01-31 Black & Decker Inc. Saw blade for cutting cement board
US20110179932A1 (en) * 2010-01-26 2011-07-28 Hyde Tools, Inc. Circular cutting blade
US9517571B2 (en) * 2010-01-26 2016-12-13 Hyde Tools, Inc. Circular cutting blade
US20210291285A1 (en) * 2017-04-21 2021-09-23 Husqvarna Ab Cutting Blade and Method for Producing Such a Blade
US11701724B2 (en) * 2017-04-21 2023-07-18 Husqvarna Ab Cutting blade and method for producing such a blade
WO2021116480A1 (de) 2019-12-13 2021-06-17 Festool Gmbh Vorritzwerkzeug für eine sägemaschine
DE102019134413A1 (de) * 2019-12-13 2021-06-17 Festool Gmbh Vorritzwerkzeug für eine Sägemaschine
CN114786856A (zh) * 2019-12-13 2022-07-22 费斯托工具有限责任公司 用于锯切机器的预先划刻工具

Also Published As

Publication number Publication date
ATE233634T1 (de) 2003-03-15
EP0756912A2 (de) 1997-02-05
NL1000912C1 (nl) 1997-02-04
DE69626453T2 (de) 2003-12-24
EP0756912B1 (de) 2003-03-05
EP0756912A3 (de) 1997-05-07
DE69626453D1 (de) 2003-04-10

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